Refrigerating apparatus

Abstract

Refrigerating apparatus comprising freezing and refrigerating compartments, to be controlled to different temperatures, which are provided with respective evaporators. During operation of a compressor, liquid refrigerant is always fed to the freezer evaporator, but is selectively fed to the refrigerator evaporator by function of a feed control device which comprises a vapor bubble pump as its essential component. The feed control device is supported by an insulation board which, in turn, is mounted on the back surface of an inner shell forming the freezing compartment such that a ratio of a distance 1 between the outer surface of the inner shell of the freezing compartment and the innermost surface of the feed control device with respect to the thickness m of the insulation wall filling the heat-insulation space defined by the inner shell and an outer shell of the freezing compartment.

What is claimed is: 
     
       1. In refrigerating apparatus including a compressor, a plurality of compartments to be controlled to different temperatures, each compartment being thermally insulated from ambient temperature by insulation wall members and being provided with a refrigerant evaporator; and feed control means for controlling refrigerant flow caused by said compressor to at least one of said evaporators; the improvement wherein said feed control means includes a vapor bubble pump positioned within one of said insulation wall members adjacent one of said compartments, and wherein said vapor bubble pump is mounted on a surface spaced from the outer surface said adjacent compartment a distance L for maintaining the temperature of said bubble pump lower than the ambient temperature of said one of said insulation wall members.   
     
     
       2. The refrigerating apparatus according to claim 1 wherein a ratio of said distance L with respect to the thickness M of the insulation wall member containing said feed control means is not less than 0.13.   
     
     
       3. The refrigerating apparatus according to claims 1 or 2, wherein said feed control means, including said bubble pump, are mounted on a planar surface, said planar surface being spaced from said outer surface of said one compartment by the distance L.   
     
     
       4. The refrigerating apparatus according to claim 3, wherein said planar surface is a surface of a plate member made of heat insulation material.   
     
     
       5. The refrigerating apparatus according to claim 4, wherein said plate member is provided with a horizontal base line mark for aligning some of the parts forming said feed control means.   
     
     
       6. The refrigerating apparatus according to claim 5, wherein said plate member includes prearranged means for securing said aligned parts with respect to said horizontal base line mark for preventing vertical movement. 
     
     
       7. The refrigerating apparatus of claim 1 wherein said feed control means includes a tank for liquid refrigerant, a chamber for receiving the refrigerant and a conduit for transmitting the refrigerant from the tank to the chamber and said vapor bubble pump includes a portion of the wall of said conduit, the first part of said portion of the conduit wall, in the direction of flow of the refrigerant, being irregular and the following part of said portion being smooth, and said vapor bubble pump also including heater means surrounding both the irregular and smooth parts of said portion of the wall of said conduit. 
     
     
       8. The refrigerating apparatus of claim 7 wherein said irregular part of the portion of the conduit wall is constituted of alternating concave and convex surfaces.